Electronic Thesis and Dissertation Repository


Master of Science


Health and Rehabilitation Sciences


Trevor Birmingham




Objectives: 1) Estimate test-retest reliability of knee angles and moments during gait in patients with knee osteoarthritis (OA) using the Gait Real-Time Analysis Interactive Lab (GRAIL); 2) Examine concurrent validity of knee angles and moments using the GRAIL and overground system (gold standard); and 3) Examine known-groups validity of knee angles and moments in patients with knee OA and healthy ontrols.

Methods: Patients and controls walked using both systems to produce knee angle and moment waveforms during stance, enabling discrete measure comparisons. atients completed a second session within one week.

Results: Intraclass correlation coefficients ranged from 0.52-to-0.93 for test-retest reliability. Pearson correlations ranged from 0.05-to-0.96 with transverse plane peaks being weakest. Patients had significantly higher first peak knee adduction moments than controls (0.58 %BW*ht).

Conclusion: Preliminary results suggest adequate reliability and validity of knee angles and moments in patients using the GRAIL. Knee transverse plane measures should be interpreted cautiously.

Available for download on Monday, January 01, 2018

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